孕妇并发外科疾病,施行限期性手术的一最佳时间是()
A.妊娠1~3个月
B.妊娠3~4个月
C.妊娠4~6个月
D.妊娠5~7个月
E.生产以后
参考答案:C
减去-2x后,等于4x2-2x-59代数式是( )
A.4x2-5x-5
B.-4x2+5x+5
C.4x2-x+5
D.4x2-5
—Will you be _____ this afternoon, John?
—It depends. I’m afraid I’ll be called in by my manager.
A.suitable
B.convenient
C.accurate
D. available